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LT1370CR

製品説明
仕様・特性

LT1370 500kHz High Efficiency 6A Switching Regulator U FEATURES DESCRIPTION ■ The LT ®1370 is a monolithic high frequency current mode switching regulator. It can be operated in all standard switching configurations including boost, buck, flyback, forward, inverting and “Cuk.” A 6A high efficiency switch is included on the die, along with all oscillator, control and protection circuitry. ■ ■ ■ ■ ■ ■ ■ ■ ■ Faster Switching with Increased Efficiency Uses Small Inductors: 4.7µH All Surface Mount Components Low Minimum Supply Voltage: 2.7V Quiescent Current: 4.5mA Typ Current Limited Power Switch: 6A Regulates Positive or Negative Outputs Shutdown Supply Current: 12µA Typ Easy External Synchronization Switch Resistance: 0.065Ω Typ The LT1370 typically consumes only 4.5mA quiescent current and has higher efficiency than previous parts. High frequency switching allows for very small inductors to be used. New design techniques increase flexibility and maintain ease of use. Switching is easily synchronized to an external logic level source. A logic low on the Shutdown pin reduces supply current to 12µA. Unique error amplifier circuitry can regulate positive or negative output voltage while maintaining simple frequency compensation techniques. Nonlinear error amplifier transconductance reduces output overshoot on start-up or overload recovery. Oscillator frequency shifting protects external components during overload conditions. U APPLICATIONS ■ ■ ■ ■ Boost Regulators Laptop Computer Supplies Multiple Output Flyback Supplies Inverting Supplies , LTC and LT are registered trademarks of Linear Technology Corporation. U TYPICAL APPLICATION 5V to 12V Boost Converter L1* VIN OFF ON VOUT† 12V VSW FB S/S + LT1370 + C1** 22µF 25V GND C2 0.047µF R3 2k VC R2 6.19k 1% C4** 22µF 25V ×2 *COILTRONICS UP2-4R7 (4.7µH) UP4-100 (10µH) **AVX TPSD226M025R0200 †MAX I OUT L1 IOUT 4.7µH 1.8A 10µH 2A C3 0.0047µF LT1370 • TA01 VIN = 5V L = 10µH 90 R1 53.6k 1% EFFICIENCY (%) 5V 12V Output Efficiency 92 D1 MBRD835L 88 86 84 82 80 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 LOAD CURRENT (A) LT1370 • TA02 sn1370 1370fs 1

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